Nothing to show; continued on-and-off trial and error trimming. Got it to a legitimate 3/32" measured gap, and now only at the last 6" of the aft lower cowl centerline.
With the additional trimming on the "bowl" portion of the cowl, it's now obvious that I have to trim some metal from the right side of the lower oil cooler baffle; did this on the left, but right has previously been OK. The continued refinement of the trim is coming together nicely, but now other areas are obvious to be trimmed (like the baffle). Getting close.